Truss.



no. 678,379.- Pmntea muy le, Ism. y

I. H. DAVIS.

TBUSS.

(Appumm am n, 1000.)

(In lndol.)

FIG? 176-1. 2/ t MITESSES Zin??? UNrTED STATES PATENT OFFICE.

NATHAN H. DAvIs, or PHiLAnELPHIA," PENNSYLVANIA.

TRUSS.

SPECIFICATION forming part 0f Letters Patent NO. 678,379,1dated July 16, 1901. y

Application filed August v1l, 1900. Seria1No.26,617. (No model.)

To all whom t may concern.:

Beit known that I, NATHAN H. DAVIS, a citii zen of the United States of America, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented a certain new and useful Improvement in Trusses, o f which the following is a true and exact description, reference being had to the accompanyin g drawings, which form a part thereof.

My invention relates to the construction of trusses, and vis especially intended for the manufacture of trusses adapted for use as brake-beams or car-holsters, though of coursev it is also adapted for other uses.

The object of my invention is to provide a truss of great simplicity of construction and one having very few detachable parts. In my former patent, No. 574,887, of January 12, 1897, I have shown and described a truss made from an iron beam longitudinally slit intermediate its ends and then spread into truss form by upsetting one of the divided portions in order to shorten it and at the same time drawing away the other divided portion, the two portions thus spread apart being stayed in position by a strut.

My present invention consists in a truss which, like my patented truss, is made from a beam longitudinally slit in the saine manner, but in which in place of upsetting one of the divided portions I effect a similar shortening by bending or corrugating the one portion, the other portion being spread or drawn out in the same manner as in my former invenion.

A further feature of my present invention portion of the truss with a metal head, pref-v erably of metal cast upon the said portion of the bar, such a head staying or bracing the bent or corrugated portion, so that it is as strong as any other portion of the truss, and a strut separating the spread portions of the truss is preferably formed with or connected to such metal head. Y

Reference being now had to the drawings which illustrate my invention, Figure l is an end View of an I-beam such as YI prefer to use in the construction of my truss, Fig. 2 being a side elevation of such a beam. Fig. 3 is a side elevation of the beam with a longi- Fig. 8 is a side elevation of the center of the truss, showing the employment of a separable head in place of a head cast upon the truss; and Fig. 9 is a cross-section on the line 9 9 of Fig. 8.

A indicates the beam of which the truss is made, having preferably the form of an I- beam, A indicating the central web, and A2 and A"s the upper and lower flanges of the beam.

B indicates the slit made longitudinally in the beam and extending from the two points b b, a2 indicating the portion of the beam lying above the slit and a3 the portion lying below it.

C is a bend or corrugation formed in the portion a2 of the beam in order to shorten it when the lower divided portion a3 is'drawn out and away from the portion a2, as indicated in Figs. 4L, 6, and 8. The direction in which the bend or corrugation Gis made is not of the essence of my invention, and the beam 'may be bent in any convenient manner-as,

for instance, as shown in Fig. 5, where it is bent upward, as indicated at C.

D, Fig. 5, is a cast-metal head surrounding the bent portion C and having extending from it a strut, (indicated at D.) D2, Figs. 6 and 7, also indicates a cast-metal head cast upon the bent portion C of the truss-beam and having a strut D extending from it and connecting, as indicated at d2, with the spread division a3 of the beam. Y

D3 D3, Figs. 8 and 9, indicate divisions of a separable head, which may be of either forged or cast metal and which are bolted together, so as to inclose and hold the bent portion C of the truss.

d' d indicate truss extensions of the head divisions; E E, bolts holding the divided heads and struts together.

It will be obvious that a truss constructed as above described is one of great strength and at the same time one having the minimum number' of separable parts and one which is constructed with great ease.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A truss formed of a beam of metal slit longitudinally intermediate its ends and having its divided portions spread apart and one said portion so corrugated or crimped as to in eiiect shorten it relatively to the other, said divided and spread portions being held in relative position by a strut.

2. A truss formed of an I-beam of metal slit longitudinally intermediate its ends and having its divided portions spread apart and one said portion so corrugated or crimped as to in effect shorten it relatively to the other, said divided and spread portions being held in relative position by a strut.

3. A truss formed of a beam of metal slit longitudinally intermediate its ends and having its divided portions spread apart and one said portion so corrugated or crimped as to in effect shorten it relatively to the other, in combination with a metal head secured to and inclosingtho said corrugated or crimped por tion and a strutinterposed between the spread portions of the bar.

4. A truss formed of a beam of metal slit longitudinally intermediate its ends and having its divided portions spread apart and one said portion so corrugated or crimped as to in eilect shorten it relatively to the other, in combination with a metal head secured to and inclosing the said corrugated or crimped portion and a strut interposed between the spread portions of the bar and extending from the metal head to the opposite spread portion.

5. A truss formed of a beam of metal slit longitudinally intermediate its ends and having its divided portions spread apart and one said portion so corrugated or crimped as to in eect shorten it relatively to the other, in combination with an integral cast-metal head inclosing the said corrugated or crimped portion and a strut interposed between the spread l portions of the bar.

NATHAN II. DAVIS.

Witnesses:

CHAs. F. MYERS, D. STEWART. 

